(adj) จำนวนมาก (แต่ไม่ได้บอกตัวเลขเจาะจง)เช่น AsiaNews interviewed the wife of one of them: the story of the umpteenth victim of this unjust law features years of threats by Islamic fundamentalists.; I woke up around 4am for an umpteenth potty trip and then couldn't get back to sleep. So I ended up getting up around 5:30 and eating a piece of cake.
[りょう, ryou] (n, pref) (1) both (e.g. both shoulders, etc.); (n) (2) ryo (obsolete unit of currency); (3) (See 斤) 41-42 g (one sixteenth of a kin); (4) (See 反・たん) 2 tan (measure of fabric size); (ctr) (5) counter for carriages (e.g. in a train)#694